SEOUL, Nov. 23 (Yonhap) -- President Lee Myung-bak ordered his military Tuesday to strike North Korea's missile base around its coastline artillery positions if it shows signs of additional provocation, his spokeswoman said.

In a video conference with Gen. Han Min-koo, chairman of the Joint Chiefs of Staff, the president ordered "multiple-fold retaliation" against the North for its artillery attack on a South Korean island, according to presidential spokeswoman Kim Hee-jung.